/Engine/Source/Runtime/Engine/Classes/Engine/StreamableManager.h
Creates a combined handle, which will wait for other handles to complete before completing. The child handles will be held as hard references as long as this handle is active.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FStreamableHandle](API\Runtime\Engine\Engine\FStreamableHandle) > CreateCombinedHandle ( const TConstArrayView< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FStreamableHandle](API\Runtime\Engine\Engine\FStreamableHandle) >> & ChildHandles, const [FString](API\Runtime\Core\Containers\FString) & DebugName, EStreamableManagerCombinedHandleOptions Options )